A simply excellent game!
Conceptually the idea of actually recreating a painting through gameplay is extremely cool and the core gameplay loop of joining up similar shape and creating lines as a byproduct is likewise great. What I like about this the most is that you're almost creating the painting by accident, the piece is created as a side effect, not direct cause of you playing the game.
That said, ultimately I think that the final result ends up quite differently to Amendment # 8 by the end of it. Adding a slight transparency to the paint and darkening the letters with each layer of paint would help it pop out more like the original instead of just looking like a Pollock painting. At least you won't need to change much for your actual planned Pollock painting down the line!
I love the fact that you can keep your painting once your done with it as well as the simplicity of just saving it to where you want instead of having to dig up some screenshot folder like in most games. Some of the extra features seemed a bit unnecessary. A pause functionality is always good but I don't see the point in speeding up the game if it just makes it borderline unplayable.
The Art and UI is very clean and pleasing but a better in game tutorial would be highly appreciated.
You've done a outstanding job at this, very well done! Can't wait for a full release!